XBB.1.5: What we know to date on this currently dominant viral subvariant

Research suggests that the bivalent Covid-19 vaccines are more effective in producing an antibody response to XBB.1.5, compared to the earlier vaccines. — AFP

The Omicron viral subvariant XBB.1.5 is the most transmissible of the SARS-CoV-2 subvariants to emerge so far, and has been spreading quickly across the United States.

Here’s what we know – and don’t – about XBB.1.5.